public class Example3_6 {
  public static void main(String args[]) {
    double sum=0,item=1;
    int i=1,n=20;
    while(i<=n) {
    sum=sum+item;
    i=i+1;
    item=item*(1.0/i);
    }
  System.out.println("sum="+sum);
  }
}
